SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-28T02:52:27-06:00SparkFun ElectronicsCustomer #1187592 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #1187592urn:uuid:f06fa0f2-36ad-e899-bcd0-672243b5399b2017-10-24T04:15:23-06:00<p>Can I sink 15mA per LED x 8 simultaneously with this ? 120mA total ? I am thinking about putting two of these behind an MCP23S17 SPI port expander on a Teensy.</p>
TyTower on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPTyTowerurn:uuid:7affecfe-bba7-9097-792b-299d83528ef72014-08-23T01:21:36-06:00<p>The Nuts and volts limk does not happen and I could not find it atall</p>
hydronics on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPhydronicsurn:uuid:164ffde9-f05d-9d5e-42ac-52481649287b2013-10-23T01:07:16-06:00<p>In the description, ADD the word transistor so it shows up when you search for a transistor.<p>I feel like a lot of times I'm never satisfied with Sparkfun search results. Maybe I'm spoiled by google.</p></p>
gstein on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPgsteinurn:uuid:38715ea7-8536-e22a-9486-ea0a78b9c1c12013-08-16T01:18:49-06:00<p>According to the datasheet, the "typical" Low-to-High transition takes 130 ns. H-to-L is typically 20 ns. Round up, call it 200 ns, and you can cycle these darlington pairs at about 5 MHz. If you're doing PWM for LEDs, then you would typically use a mere 100 Hz.</p>
hurley_108 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPhurley_108urn:uuid:6bd6e2d3-f085-c776-e461-ce86108ae3ca2013-07-31T14:55:32-06:00<p>There's a line in the datasheet, though, that reads "Total substrate-terminal current . . . −2.5 A," which leads me to believe that you can switch up to 500 mA on each pin, but can't sink more than 2.5 A total. So if you want to switch 4 A continuous, you cant do it with (just one of) this chip, but if you had 8 loads of 500 mA each, and didn't turn more than 5 on at a time, you'd probably be OK.</p>
Customer #449274 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #449274urn:uuid:bb0384f6-d841-b9b4-4e18-3ad32bbba2462013-06-24T14:40:10-06:00<p>Does this come with a housing to be soldered on to a PCB? Do you sell them?</p>
Customer #429224 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #429224urn:uuid:afdc46d4-262c-f77c-222f-bef5a20239142013-04-18T21:36:41-06:00<p>Did you ever get this working. I need the same</p>
flickerfly on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPflickerflyurn:uuid:e41c5120-bbfe-6cbe-4ce6-df4e924751312013-01-08T19:15:17-07:00<p>If I read the data sheet correctly, the rating is per output.</p>
HungryMaggot on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPHungryMaggoturn:uuid:173e00fb-3758-f93a-c69b-bedd7ebc8d272013-01-04T09:59:24-07:00<p>ULN2803 current: shared or per output?<p>Hello, one question. ULN2803's datasheet says "500mA output".
So my question is: Those 500mA are:
a) per each single output? (500mA each output, so paralleled the 8 outputs will draw 500mA*8=4000mA?)
b) shared per the whole chip? (500mA/8 outputs= 62,5mA per output)</p></p>
Customer #327274 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #327274urn:uuid:b7060966-83a9-82c7-9718-e6156f5038912012-11-15T13:39:39-07:00<p>Can I drive these directly from any arduino? (5v)
And how is input mA related to output current/voltage?
Are these capable of switching fast enough to allow pwm?
I'm new to reading datasheets...</p>
0xdec on COM-00312 - Darlington Driver 8-Channel ULN2803 DIP0xdecurn:uuid:0bc4e168-4db2-3454-e0da-c3773d43a85f2012-07-05T07:37:14-06:00<p>Sorry if this is a dumb question, but I'm new with this stuff. If I connected the common pin to ground would I be able to connect each of the collectors to ground and drain current?</p>
Customer #327041 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #327041urn:uuid:963d19e9-de5e-1603-8a23-57a22637c32a2012-06-14T07:15:38-06:00<p>Could anyone give me some advice whether I could use this with a TI Launchpad to drive "blocks" of LEDs in parallel. Looking to make a table with LED effects and so just want to be able to switch between 6-8 blocks of parallel LED arrays. Problem is, TI output pins are only 3.3V...none of the LED arrays require more than 500mA and have voltages of say 12V.</p>
XBuilder on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPXBuilderurn:uuid:9037d788-f629-cc0e-1eef-ea82d1e3dcc72012-04-18T14:46:41-06:00<p>never mind... It works perfectly (as we all knew it would. this is Spark Fun after all!!)</p>
SPCO on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPSPCOurn:uuid:b86ada1e-ea1a-40bf-ff30-46d7c008c7152012-01-20T15:54:21-07:00<p>Mr. Shaanxi, why do you keep commenting on SparkFun items with links to a (presumably cheaper and shoddier) part with an Engrish datasheet? I'm sure your company in China isn't interested in selling singles to the hobby market.</p>
JudeAustin on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPJudeAustinurn:uuid:6aa221e0-4fe8-4e80-a297-f7b5a0217b872011-05-01T18:19:45-06:00<p>I use mine with the PWM pins on my Arduino Uno to control an RGB LED strip, so I would think you would be alright as long as you don't exceed 500mA.</p>
jenesaisdiq on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPjenesaisdiqurn:uuid:6a1efa1e-c90d-0266-cc6d-9c8a4388ab0c2011-04-25T21:47:32-06:00<p>This worked woooonderfully, btw. So, so, so easy to just solder the Darlington directly to the Pro Mini. Used this configuration in 3 projects so far, and stocking up for more.</p>
Customer #172228 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #172228urn:uuid:a33f0d0c-ea29-c3cd-b393-12319c5fe21a2011-04-19T03:06:47-06:00<p>It can drive 500 mA per channel, and the outputs/inputs can be connected together to switch more current.</p>
Customer #172228 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #172228urn:uuid:c8704745-6eea-2395-1979-5fe96d15ae5e2011-04-19T03:05:20-06:00<p>Datasheet says 3 volts is required to sink 350 mA.</p>
Customer #37591 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCustomer #37591urn:uuid:c65624d7-ee2a-3696-a502-33c7463c8b622011-03-08T12:01:03-07:00<p>Will these work for switching high-power, 3V LEDs from a 5V control source?</p>
jenesaisdiq on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPjenesaisdiqurn:uuid:ec15c627-2be5-9de4-13d3-9ff8855b091e2011-02-11T18:00:12-07:00<p>Anyone know if I can drive this directly off 3.3V? Works great with 5V, and the pinout lines up perfectly with the Pro Mini.</p>
XBuilder on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPXBuilderurn:uuid:acc70895-78ec-2cdf-611b-40c2ac0c0ce32011-01-07T18:03:59-07:00<p>Can this be used to drive motors?</p>
Young Maker on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPYoung Makerurn:uuid:a141e11e-1473-f0a6-68d1-3e31fdc2e4e22010-12-21T13:39:06-07:00<p>You need PNP for high side stuff. I'm pretty sure this is NPN</p>
CrashOverride on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCrashOverrideurn:uuid:5cde8ff1-509c-2572-2600-8e0d418edec42010-12-06T05:28:10-07:00<p>I think if you use it as a high-side, you'll end up getting latching like a thyristor.... you cant turn it off.</p>
CrashOverride on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPCrashOverrideurn:uuid:ffd8c351-378f-9fd0-f97b-5295f2dad1a92010-12-06T05:26:47-07:00<p>I dont think you can use these as a high-side switch. If the load is any bit reactive, you'll have latching problems...I think... most chips that are high side are marketed as exclusively high-side</p>
Bryan3 on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPBryan3urn:uuid:b70d120f-68df-4aea-eb78-20778958fc7e2010-11-29T11:43:08-07:00<p>Can NPN darlingtons used as a high side switch? If I connect the collector to 5V and the base as well, what will be the emitter voltage? <br /><br>
<br /><br>
According to the datasheet Vce(saturation) is 1V, so would that mean that at the emitter the voltage is 4V?</p>
Student on COM-00312 - Darlington Driver 8-Channel ULN2803 DIPStudenturn:uuid:1840c6ed-0338-e7ed-5e9e-c39690e6fd302008-08-03T06:16:58-06:00<p>do you have eagle library for this too??</p>